WGU C955 Applied Probability and Statistics
Module 6 Correlation & Regression 35 Questions
with Verified Answers
lurking variable - CORRECT ANSWER A variable that is not included in an analysis
but that is related to two (or more) other associated variables which were
analyzed.
observational study - CORRECT ANSWER The researcher observes if there is an
association between variables. There is no treatment or control group.
sampling method - CORRECT ANSWER The technique used to select people within
the sampling frame.
correlation - CORRECT ANSWER An observed relationship between two
quantitative variables. While this is most commonly a linear relationship, it does
not need to be. Note that observing a relationship does NOT imply that there is a
meaningful causal link between the variables.
coordinate plane - CORRECT ANSWER A tool for graphing consisting of a horizontal
x-axis and a vertical y-axis.
correlation coefficient - CORRECT ANSWER A measure of the linear relationship
between two attributes. The numerical value demonstrates how closely the
attributes vary together. Correlation coefficients near -1 and +1 have strong linear
correlation, while a correlation coefficient near 0 has weak (or no) linear
correlation.
, linear interpolation - CORRECT ANSWER Estimation using the linear regression
equation in between known data points.
least squares - CORRECT ANSWER A technique for finding the regression line.
voluntary sample - CORRECT ANSWER Researchers invite everyone in the sampling
frame to participate. Individuals who voluntarily respond comprise the study
sample.
scatterplot - CORRECT ANSWER A graph that uses dots on a coordinate plane to
show the relationship between variables.
representative sample - CORRECT ANSWER A subset of the population with similar
characteristics to the entire population.
significance level - CORRECT ANSWER The p-value cutoff for statistical significance.
Any p-value below the set significance level is considered statistically significant.
hypothesis test - CORRECT ANSWER A statistical test that tells us whether a result
is significant.
slope-intercept form - CORRECT ANSWER A common format for the equation of a
line: y = mx + b, where m is the slope and b is the y-intercept.
Module 6 Correlation & Regression 35 Questions
with Verified Answers
lurking variable - CORRECT ANSWER A variable that is not included in an analysis
but that is related to two (or more) other associated variables which were
analyzed.
observational study - CORRECT ANSWER The researcher observes if there is an
association between variables. There is no treatment or control group.
sampling method - CORRECT ANSWER The technique used to select people within
the sampling frame.
correlation - CORRECT ANSWER An observed relationship between two
quantitative variables. While this is most commonly a linear relationship, it does
not need to be. Note that observing a relationship does NOT imply that there is a
meaningful causal link between the variables.
coordinate plane - CORRECT ANSWER A tool for graphing consisting of a horizontal
x-axis and a vertical y-axis.
correlation coefficient - CORRECT ANSWER A measure of the linear relationship
between two attributes. The numerical value demonstrates how closely the
attributes vary together. Correlation coefficients near -1 and +1 have strong linear
correlation, while a correlation coefficient near 0 has weak (or no) linear
correlation.
, linear interpolation - CORRECT ANSWER Estimation using the linear regression
equation in between known data points.
least squares - CORRECT ANSWER A technique for finding the regression line.
voluntary sample - CORRECT ANSWER Researchers invite everyone in the sampling
frame to participate. Individuals who voluntarily respond comprise the study
sample.
scatterplot - CORRECT ANSWER A graph that uses dots on a coordinate plane to
show the relationship between variables.
representative sample - CORRECT ANSWER A subset of the population with similar
characteristics to the entire population.
significance level - CORRECT ANSWER The p-value cutoff for statistical significance.
Any p-value below the set significance level is considered statistically significant.
hypothesis test - CORRECT ANSWER A statistical test that tells us whether a result
is significant.
slope-intercept form - CORRECT ANSWER A common format for the equation of a
line: y = mx + b, where m is the slope and b is the y-intercept.
